jaxws/src/java.xml.ws/share/classes/com/sun/xml/internal/ws/model/SOAPSEIModel.java

*** 1,7 ****
  /*
!  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 31,48 ****
--- 31,52 ----
  import javax.jws.WebParam.Mode;
  import javax.xml.namespace.QName;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
+ import java.util.concurrent.locks.Lock;
+ import java.util.concurrent.locks.ReentrantLock;
  
  /**
   * Creates SOAP specific RuntimeModel
   *
   * @author Vivek Pandey
   */
  public class SOAPSEIModel extends AbstractSEIModelImpl {
  
+         private final Lock lock = new ReentrantLock();
+ 
      public SOAPSEIModel(WebServiceFeatureList features) {
          super(features);
      }
  
      @Override
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--- 74,99 ----
          }
      }
  
      public Set<QName> getKnownHeaders() {
          Set<QName> headers = new HashSet<QName>();
+ 
+         try{
+                 lock.lock();
              for (JavaMethodImpl method : getJavaMethods()) {
               // fill in request headers
               Iterator<ParameterImpl> params = method.getRequestParameters().iterator();
               fillHeaders(params, headers, Mode.IN);
  
              // fill in response headers
               params = method.getResponseParameters().iterator();
               fillHeaders(params, headers, Mode.OUT);
                            }
+         }finally
+         {
+                 lock.unlock();
+          }
          return headers;
      }
  
      /**
       * @param params